Abrasive belt attachment for abrasive wheel machines



. Sept. 1952 R. M. BELL 2,612,007

7 ABRASIVE BELT ATTACHMENT FOR ABRASIVE-WHEEL MACHINES Filed Oct. 5, 1950 2 Sl-lEETS-ySl-IEET 1 IN VEN TOR; I

Sept. 30, 1952 R. M. BELL ABRASIVE BELT ATTACHMENT FOR ABRASIVE WHEEL. ommas Filed Oct. 5, 1950 2 SHEETS -SHEET 2 IN V EN TOR.

fa /J07 K 5! Patented Sept. 30, 1952 ABRASIVE BELT ATTACHIHENT FOR ABBASKVE WHEEL MACHINES Ramsay Bell, Kalamazoo, Mich, assignor to Hammond Machinery Builders, Inc., Kalama= zoo, Mich.

Application October 5 1950,-Seria.l No. 188,640

4 Claims. (01. 51-135) chine having an abrasive wheel to a belt type machine employing a continuous abrasive belt.

Second, to provide an attachment which will permit an abrasive belt to be adjustably trained around the abrasive wheel of a polishing machine and an idler pulley.

Third, to provide an abrasive belt attachment with an idler pulley which is laterally and angularly adjustable in two planes relative to a pol ishing machine on which the attachment is mounted to properly train an abrasive belt around the pulley and the wheel of the polishing machine regardless of the diameter of the wheel.

Fourth, to provide an abrasive belt attachment which is attachable to the head of a polishing machine through 360 degrees of angular adjustment relative to the axis of the work engaging wheel of the machine.

Fifth, to provide a polishing attachment hav-- ing a pneumatically cushioned pulley support for quickly adjusting the tension of a belt trained around the pulley.

Sixth, to provide a pulley attachment which is entirely effective and yet inexpensive and which permits the conversion of a wheel type abrading machine to a continuous belt type abrading machine.

Other objects and advantages of my invention will be apparent from a consideration of the following description and claims. The drawings, of which there are two sheets, illustrate a preferred form of my attachment.

Fig. 1 is an elevational view of my attachment operatively installed on a polishing machine.

Fig. 2 is a side elevational view of the attachment taken along the plane of the line 2 -2 in Fig. 1.

Fig. 3 is an enlarged elevational view of the upper end of the attachment with portions of the abrasive belt and belt supporting head broken away in vertical cross section.

Throughout the following description and claims, the term, polishing, as applied to the function of the belt and polishing machine and wheel is intended to cover all types of abrading operations and is not intended to be limited to a particular degree of abrading operation. Thus my polishing attachment is eifective in rough grinding, polishing and buifing operations de- In the drawings, I have illustrated a familiar type of polishing machine having a polishing wheel I mounted on a spindle or shaft 2. The shaft 2 is rotatably mounted in a cylindrical housing 3 which projects from the head 4 of the machine. The head 4 includes an electrical driving motor 5 and suitable connecting'belts or chains enclosed in the guard 6 for connecting the motor to the shaft 2. The head itself is angularly adjustably mounted on the face plate 1 carried on the top of. a pedestal 8. Provision is commonly made in the pedestal for vertically and laterally adjusting the same, but this construction forms no part of the present invention. The head i and wheel I are illustrated in operative work-engaging position relative to work pieces W mounted tation of the wheel. The work pieces themselves are rotated about their supporting axes to com-- pletely finish annular portions of the work contacted by the wheel. In order to convert the foregoing wheel polishing machine to a belt type polishing machine, I have provided the attachment generally indicated at H and includin the rod-like arm 12. The lower end of the arm I2 is received in a socket l3 formed in the attaching bracket Hi. The socket I3 is'partially split and provided with a clamping bolt at l5 for securely gripping the arm, and a split circular clamp l6 is provided at the lower end of the bracket for removably clamping the bracket and arm to the housing 3 which encloses the polishing wheel shaft 2. It should be noted that the split clamp is and therefore the arm l2 may beattached to the housing 3 through 360 degrees of angular adjustment around the housing 3. p

The upper end of the arm I2 is received in the socket ll of an upper bracket l8, and the socket I! is partially split and provided with clamp bolts as at 19 for gripping the arm H. The bracket i8 is provided with a laterally offset portion 25.

with compressed air to extend the piston and rod upwardly.

The belt supporting fixture 24 is generally U- shaped as is most clearly illustrated in Fig. 2, and the upper ends of the arms 2i thereof are transversely bored to form slideways for the slide rods 28.

The two slide rods 28 form movable supports for the two end frames 29 and 318. The end frame 29 is generally diamond shaped in outline having lower diverging arms 31 joined at their outer ends with the upwardly converging arms 32. The junctions of the arms 3! and 32 are bored to be received on and clamped to the slide rods 28. The junction of the lower arms 3! is bored and tapped to receive the lateral adjustment screw 33. The junction of the upwardly converging arms 3'; is transversely slotted in an upwardly openingyoke 35 which receives the flattened end of a pulley shaft 35. A bolt 36 clamps the pulley shaft f in place in the yoke.

The otherend frame 39 is orsimilar construction to the end frame 29 and may be formed from a like casting or forging. However, the yoke por tion 34A is provided with'a cover strip 3?, and vertical adjusting screws 38 are threaded through the cover 37 and the bottom of the yoke MA to vertically engage the top and bottom of the other end of the pulley shaft 35. The pulley shaft may thus be tilted in a vertical plane to bring itinto parallelism with the shaft 2 of the polishing machine on which the attachment is mounted.

The pulley shaft 35 rotatably supports the idier pulley 39 around which the abrasive belt it is trained. In order to adjust the pulley 3d and belt 3E laterally with respect to the attachment arm 2 to center the belt about the polishing Wheel i, the lateral adjusting screw which is threaded through the end frame was previously described extends througha central boss or abutment ti formed on the belt supporting fixture 22-. A coil spring d2 compressed between the abutment and a collar 43 on the screw urges the screw and frame 29 away from the axis of the rod 22 while a second collar &5 on the adjusting screw limits the longitudinal movement of the screw Rotation of the screw d3 by its-hand wheel 45. will obviously shift the end frames 29 and iii}, slide rods 28 and pulley relative to the bracket 24%.

In order to angularly adjust the bracket 24 and pulley 38 relative to the arm i2 and the polishing wheel l for proper tracking of the belt the bracket 24 is provided with a laterally projecting arm 45. The outer end of the arm d6 carries a depending pin or bolt 4i which projects downwardly through a slot formed in the boss id on the upper end of the bracket it. An angular adjusting screw 4:9 is threaded through the side of the boss =28 and into the slot to engage the side of the pin ll. A spring (not illustrated) is arranged to return the pin 37 against the screw 69. Adjustment of the screw 39 will clearly swing the pin 4 11,3111]. lt and bracket 2 angularly about the axis of the rod 2 i.

From the foregoing description, it should be apparent that my attachment is easily attachable to any wheel type polishing machine having a stationary circular housing for its wheel shaft. If the wheel shaft housing is of proper size and shape, no modification or adjustment of the polishing machine is required, as the polishing wheel forms the driving pulley for the abrasive belt. The attachment is quickly mounted or demounted, and the belt is easily tensioned and aligned over the polishing wheel i and idler pulley 39 on the attachment. The operator of a polishing plant can thus quickly and inexpensively convert his wheel type polishing machines to belt type polishing machines whenever the use of a belt on a particular type of work appears most desirable.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A belt attachment for a wheel type polishing machine having a polishing wheel shaft projecting from a cylindrical housing comprising, an arm having a split clamp at its inner end attachable to said housing in angularly adjusted position therearound, a bracket secured to the outer end of said arm and having a laterally projecting portion, a supporting rod slidably received in said lateral portion and parallel to said arm, a pneumatic cylinder and piston associated with the inner end of said rod to urge said rod axially outwardly, a belt supporting fixture of outwardly U- shaped cross section secured to the outer end of said rod, a pairof slide rods transversely slidably mounted in the ends of the arms of said fixture, a pair'of end frames carried by the ends of said slide rods and having shaft receiving yokes formed at their outer ends, a pulley shaft supported in said yokes and vertically adjustably mounted in one of said yokes, a lateral adjusting screw threadedly engaged with one of said frames and yieldably abuttingly engaged with said fixture for laterally adjustingsaid end frames on said fixture, an arm projecting laterally from said fixture and having a depending pin positioned alongside of said bracket, and an angular adjusting screw threadedly engaged with said bracket to bear against said pin to adjust said pin and arm angularly about the axis of said rod.

2. A-belt attachment for a wheel type polishing machine having a polishing wheel shaft projecting from a cylindrical housing comprising, an arm having a clamp at its inner end attachable to said housing in angularly adjusted position therearound, a bracket secured to the outer end of said arm and having a laterally projecting portion, a supporting rod rotatably received in said lateral portion and parallel to said arm, a

belt supporting fixture of outwardly U-shaped cross section secured to the outer end or" said rod. a pair of slide rods transversely slidably mounted in the ends of the arms of said fixture, a pair of end frames carried by the ends of said slide rods, a pulley shaft supported in the outer ends of said frames, a lateral adjusting screw threadedly engaged with one of said frames and abuttingly engaged with said fixture for laterally adjusting said end frames on said fixture, a second arm projecting laterally from said fixture and depending alongside of said bracket, and an angular adjusting screw threadedly engaged with said bracket to bear against said second arm to adjust said fixture angularly about the axis of said rod.

3. A belt attachment for a wheel type polishing machine having a polishing wheel shaft projecting from a cylindrical housing comprising, an arm having a split clamp at its inner end attachable to said housin an angularly adjusted position therearound, a bracket secured to the outer end of said arm and having a laterally projecting portion, a supporting rod rotatably received in said lateral portion and parallel to said arm, a belt supporting fixture member secured to the outer end of said rod, a frame member slidably carried by said fixture member and having shaft receiving openings at its outer end, a pulley shaft supported in said openings, a lateral adjusting screw threadedly engaged with said frame and abuttingly engaged with said fixture for laterally adjusting said frame member on said fixture member, a second arm projecting laterally from said fixture member and depending alongside of said bracket, and an angular adjusting screw threadedly engaged with said bracket to bear against said second arm to adjust said fixture member angularly about the axis of said rod.

4. A belt attachment for a wheel type polishing machine having a polishing wheel shaft projecting from a cylindrical housing comprising, an arm having a split clamp at its inner end attachable to said housing in angularly adjusted position therearound, a bracket secured to the outer end of said arm and having a laterally projecting portion, a supporting rod rotatably received in said lateral portion and parallel to said arm, a belt. supporting fixture member secured to the outer end of said rod, a frame member slidably carried by said fixture member and having shaft receiving openings at its outer end, a pulley shaft supported in said openings, a lateral adjusting screw threadedly engaged with one of said members and abuttingly engaged with the other of said members for laterally adjusting said frame member on said fixture member, a second arm projecting laterally from said fixture member and depending alongside of said bracket, and an angular adjusting screw threadedly engaged with said bracket to bear against said second arm to adjust said fixture member angularly about the axis of said rod.

RAMSAY M. BELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

